Develop Reference

get sort direction from jquery bootgrid in C#

i have setup a jquery bootgrid on a .net mvc web page, it shows me a grid with a few commands,like sorting,search autocomplete,scroll pages. Library is here: http://www.jquery-bootgrid.com/documentation
The grid works well, and i decided to send the commands through ajax to a function behind. The library then sends a list of strings to the function, used to handle the grid:
current 1
rowCount 10
sort[filename] asc
where filename is one of the columns for which i wanna sort. it could be sort[id], sort[name] or whatever i set my column to be.
the values are pretty clear, the ajax sends to the function the current grid page,the number of rows and the sorting direction.
but when i get in the function i can read only the first 2 values:
public ActionResult AjaxRequestData(string current,string rowCount,string sort)
this definition reads the first 2 values from the web page,but cannot read the sort ,because the actual name of the var is sort[filename], it's not an array of strings.if i either declare sort as string or string[],the result is always null.
How should i declare the variables in the action? So far i could read the sort by using formcollection["sort[filename]"],formcollection["sort[id]"] etc but i have a lot of columns and i really dont want to write out a condition for each one of them,is there any other solution to this?

Approch1.
consider you have table with columns "col1, col2, col3, ...".
you can use:
public ActionResult AjaxRequestData(string current,string rowCount,Sort sort){
//sort.col1 == 'asc' (consider sorted by col1 in ascending order)
}
public class Sort
{
public string col1 { get; set; }
public string col2 { get; set; }
public string col3 { get; set; }
//... other columns
}
Approach 2.
You can remove you parameters and parse data manually. (notice i used post here instead of get)
[HttpPost]
public object AjaxRequestData(){
string jsonContent = Request.Content.ReadAsStringAsync().Result;
Dictionary<string, string> keyvalues = new Dictionary<string, string>();
string[] keyvalue_strings = jsonContent.Split('&');
string sort_column = "";
string sort_direction = "";
for (var i = 0; i< keyvalue_strings.Length; i++)
{
var a = keyvalue_strings[i].Split('=');
a[0] = a[0].Replace("%5B", "[").Replace("%5D", "]");
keyvalues.Add(a[0], (a[1]));
if (a[0].Contains("sort"))
{
sort_column = a[0].Replace("sort[", "").Replace("]", "");
sort_direction = a[1];
}
}
//now you have keyvalues, sort_column, sort_direction.
//...
}

Newtonsoft.JsonConvert - how to deserialize JavaScript object into an object with one property being Enum?

I'm getting an error when I'm trying to use the following code:
filters.Filters = JsonConvert.DeserializeObject<List<SearchFilterItem>>(customFilterString);
The SearchFilterItem is the following class:
public Guid Id { get; set; }
public string ColumnName { get; set; }
public string ColumnDisplayName { get; set; }
public SearchColumnTypes ColumnType { get; set; } //Character, Numeric, Boolean, Date, DateTime.
public SearchOperators Operator { get; set; }
public string Value { get; set; }
public string DisplayValue { get; set; }
public string Logic { get; set; } //And / Or
From JavaScript I'm trying to send the following:
if ($.isNumeric($scope.type)) {
filter = {
columnDisplayName: 'Type Id',
columnName: 'LTypeId',
columnType: parseInt('1'),
value: $scope.type.toString(),
displayValue: $scope.type.toString(),
strOperator: 'Equals', Logic: "AND"
};
So, my problem here is how to properly send the columnType which is C# Enum?
I'm getting this error in run-time:
"Could not cast or convert from System.Int64 to Siriusware.Models.Messages.SearchColumnTypes."} System.Exception {System.ArgumentException
What should I do?

There is a StringEnumConverter attribute in Newtonsoft.Json which has this exact purpose.
You can check the associated documentation here :
https://www.newtonsoft.com/json/help/html/t_newtonsoft_json_converters_stringenumconverter.htm
Here is a blog article giving interesting inputs on the subject, like custom converter for instance :
https://bytefish.de/blog/enums_json_net/

Turned out it was my own stupid mistake. In the filterItem class the column type is another class. In that class we have yet one more ColumnType property which is an enum. So, as soon as I changed my JavaScript to use columnType: {ColumnType: 'Numeric'} it did work by itself - no extra changes were needed. I did ask my colleague to help me as well and we spent about an hour or more chasing this down until it finally dawned on me.

How to convert an array in js to an array in C#?

This i code from js. I want to set up the same thing i C#, but don't know how. I have tried using arrays, but the information is supposed to be easy to update without changing the rest of the code.
For example, i can get the summer price from: hotell[0].list[0].price_s.text
Is there a way to do this in C#(visual studio), where you can put information like this in an array?
var hotell = [];
hotell[0] = {
city: "New York",
liste: [
{name: "Aurora", price_s: 590, price_v: 690},
{name: "Downtown", price_s: 660, price_v: 750},
{name: "City Hall", price_s: 450, price_v: 530},
]
};

Create a Model class named as Hotel which is having two properties named as "city" and "liste". "liste" is nothing but a List<HotelDetails> class
public class HotelDetails
{
public string name { get; set; }
public int price_s { get; set; }
public int price_v { get; set; }
}
public class Hotel
{
public string city { get; set; }
public List<HotelDetails> liste { get; set; }
}
Next you need to convert your array to an json object and make an ajax call to your webmethod(if asp.net web form application) or make a call to your controller action (if asp.net MVC application) and pass your json object as a parameter.
After that you can play with your Hotel class

Classes for both Hotel and items within Liste would be the better implementation, like #degant mentioned.
However, you could have a list of tuple<string, int, int>.
var hotel1 = new List<Tuple<string, int, int>>
{
new Tuple<string, int, int>("Aurora", 590, 690),
new Tuple<string, int, int>("Downtown", 660, 750),
new Tuple<string, int, int>("City Hall", 450, 530)
};
You could then store all the Hotels in a dictionary:
var allhotels = new Dictionary<string, List<Tuple<string, int, int>>>
{
{"Hotel1", storage}
};
Or:
var allhotels = new Dictionary<string, List<Tuple<string, int, int>>>();
allhotels.Add("Hotel1", storage);
But as you can see it get complicated rather quickly.

The cleanest would probably be to create a class which represents your data.
class Hotel { string name; int price_s; price_v;}
Then you could either create a dictionary where the key is the citys name and the value is a list of hotels:
Dictionary<string, List<Hotel>> hotels;
Or you could create another class for this:
class HotelsPerCity{ string city; List<Hotel> hotels; }
And just keep the HotelsPerCity in a list:
List<HotelsPerCity> hotels;

Technically speaking you could use anonymous classes for this, doing something like below
var hotell = new []{
new {city = "New York",
liste= new[]{
new{name= "Aurora", price_s = 590, price_v = 690},
new {name= "Downtown", price_s = 660, price_v = 750},
new {name= "City Hall", price_s= 450, price_v= 530},
}
}};
Console.WriteLine(hotell[0].liste[1]);
The problem here is that the var keyword is inferred to a specific class by the compiler. That is, anonymous classes are contructed for a type containing fields string name, int price_s and int price_v, as well an anonymous class for the actual Hotels.
Anonymous classes are meant to be shortlived and the only way you would be able to return you hotell object from a method would be as an object causing you to have to cast it to your anonymous type later on. As it is anonymous this is hard :). You could probably also go with dynamics, but these are slow and afaik reflection base.
IE: You are in a strongly typed language and is better of declaring your classes.
Having Hotel and Suite classes
class Room {
public string name {get;set;}
public int price_s {get;set;}
public int price_v {get;set;}
}
class Hotel {
public string city {get;set;}
public List<Room> liste {get;set;}
}
you could get reasonably simple initialization not unlike (but also not identical to js):
var hotel = new Hotel[]{
new Hotel{city = "New York",
liste= new List<Room>{
new Room{name= "Aurora", price_s = 590, price_v = 690},
new Room{name= "Downtown", price_s = 660, price_v = 750},
new Room{name= "City Hall", price_s= 450, price_v= 530},
}
}};
which could be passed around with the corresponding types. Please note that the properties are usually capitalized i C#.

Java hashmap : Not write comma after printing the last entry

I'm using hashmap in Java to hold three pairs of servers in format (name,size), and then pass this hashmap to Javascript.
In Javascript there is no comma after the last entry:
data: [
{
name : "client3",
y:23,
},
{
name : "client1",
y:245,
},
{
name : "client2",
y:23,
}]
so I don't know how to get rid of this comma in Java using HashMap iterator :
for (Map.Entry<String, String> entry : listClientSize.entrySet()) {
String name = entry.getKey().toString();;
String size = entry.getValue();
out.println("name : \""+name+"\",");
out.println("y:"+size+",");
out.println("},");
}
Any ideas?

Instead of writing the comma at the end of the loop, write it at the beginning. It's much easier to check first iteration than last iteration.
boolean first = true;
for (Map.Entry<String, String> entry : listClientSize.entrySet()) {
String name = entry.getKey().toString();;
String size = entry.getValue();
if (first)
first = false;
else
out.println("},");
out.println("{");
out.println("name : \""+name+"\",");
out.println("y:"+size);
}
out.println("}");
BTW: You were missing the print of the start-brace {, and had a comma after the y value.
Update: Since that pattern for handling first iteration is so common, and the action is so simple (usually just appending a separator), I usually collapse the code as follows (don't do this if you have strict coding standards):
if (first) first = false; else out.println("},");

It seems you are creating JSON, so consider using proper JSON parser to generate your results. For instance with gson library your code could look like
Class containing single informations you want to store
public class Server{
private String name;
private int value;
public Server(String name, int value) {
this.name = name;
this.value = value;
}
//getters and setters
}
You can use this class like:
List<Server> list = new ArrayList<>();
list.add(new Server("1", 245));
list.add(new Server("2", 23));
list.add(new Server("3", 23));
Gson gson = new GsonBuilder().setPrettyPrinting().create();
String json = gson.toJson(list);
System.out.println(json);
which will generate:
[
{
"name": "1",
"value": 245
},
{
"name": "2",
"value": 23
},
{
"name": "3",
"value": 23
}
]
You can add later data = at start if you absolutely need it.

If you can use Java 8, use StringJoiner
final StringJoiner stringJoiner = new StringJoiner(",");
Map<String,String> listClientSize = new HashMap<String,String>(){{
put("client3","23");
put("client1","245");
put("client2","23");
}};
for (Map.Entry<String, String> entry : listClientSize.entrySet()) {
String name = entry.getKey().toString();;
String size = entry.getValue();
stringJoiner.add(String.format("{name:\"%s\", y:%s}", name, size));
}
System.out.println(stringJoiner.toString());

To get rid of the comma after the y property, which is the last property in the object, just do this:
for (Map.Entry<String, String> entry : listClientSize.entrySet()) {
String name = entry.getKey().toString();;
String size = entry.getValue();
out.println("name : \""+name+"\",");
out.println("y:"+size);
out.println("},");
}
To get rid of the comma at the very end, instead of printing from the for loop, build up a string and then use substring to cut off the last character after your for loop, then print the string

One easy thing you could try is accumulating the string to print in a StringBuilder, and then stripping the last comma, using substring. It should look like this:
StringBuilder output = new StringBuilder();
for (Map.Entry<String, String> entry : listClientSize.entrySet()) {
String name = entry.getKey();
String size = entry.getValue();
output.append("{name :\"").append(name).append("\", ");
output.append("y: ").append(size).append("},");
}
String toPrint = output.substring(1, output.size() - 1);
out.println(toPrint);

You probably need a way to tell if its not last entry then append the comma. One simplistic way is to keep a counter n n increment each iteration. If counter != hashmap size append comma

List<T> to Javascript array

I have the following classes defined
public ReportsViewmodel
{
public GeographicData GeographicData { get; set; }
...
}
public class GeographicData
{
public List<ZipcodeData> Regions { get; set; }
...
}
public class ZipcodeData
{
//TupleList is defined as public class TupleList<T1, T2> : List<Tuple<T1, T2>>
public TupleList<double, double> Boundries { get; set; }//Contains list of Lat/Long values for plotting on a map.
}
inside my view, I need to do something like this:
foreach (region in GeographicData.Regions)
foreach (boundry in region.Boundries)
add item1 & item2 to a 2 dimensional Javascript array
In the end, I want my javascript array to look like:
var vmBoundries= [[34.1, -85.4], [34.8, -85.234], [34.347, -85.345], [34.541, -85.434], [34.2341, -85.4]];
I can't figure out how to access the data from my view. I keep running into scope issue. For example, if I try to use a javascript for loop I can't index into my ViewModel lists because the loop variable is undefined when I call #Model.GeographicData.Regions[i]...
So how do I pull the data from my ViewModel into the Javascript array?

Typically you'd:
Transform the data into the format you want
Serialize the transformed data into JSON
Assign a JavaScript variable to the serialized value.
So, something like this:
#{
IEnumerable<double[]> flattened = vm.GeographicData.Regions
.SelectMany(region => region.Boundries
.Select(tpl => new double[] { tpl.Item1, tpl.Item2 }));
string json = new JavaScriptSerializer().Serialize(flattened);
}
<script type="text/javascript">
var arr = #json;
// do something with arr.
</script>

Something like:
var array = (from region in GeographicData.Regions
select from boundry in region.Boundries
select new object[] { boundry.Item1, boundry.Item2 }).ToArray();
This will give you a 2D array that you can then just serialize.
Example: https://dotnetfiddle.net/Y9KOaq

I would use a javascript serializer to make it easier:
using System.Web.Script.Serialization;
And add a helper method to ReportsViewmodel:
public string GetBoundriesJs()
{
var pairs =
from r in GeographicData.Regions
from b in r.Boundries
select new[] { b.Item1, b.Item2 };
return new JavaScriptSerializer().Serialize(pairs);
}
Then you can just call it where you need it in your view:
var vmBoundries = #Model.GetBoundriesJs();